Merge pull request #15067 from ARMmbed/fix_flash_overflow_callback_big_test

Greentea: Fix flash overflown issue in callback_big test

Author: Patater

platform/tests/TESTS/mbed_functional/callback/main.cpp

@@ -20,6 +20,8 @@
 #include "utest.h"
 #include <mstd_functional>
 
+#define TEST_MIN_REQ_ROM_SIZE (36 * 1024)
+
 using namespace utest::v1;
 
 template <typename T>
@@ -884,8 +886,7 @@ Case cases[] = {
     Case("Testing callbacks with 2 uint64s", test_dispatch2<uint64_t>),
     Case("Testing callbacks with 3 uint64s", test_dispatch3<uint64_t>),
     Case("Testing callbacks with 4 uint64s", test_dispatch4<uint64_t>),
-// IAR currently crashes at link time with this test - skip it as it's well beyond anything needed by real code
-#ifndef __ICCARM__
+#if !defined(__ICCARM__) && (!defined(MBED_ROM_SIZE) || (MBED_ROM_SIZE >= TEST_MIN_REQ_ROM_SIZE))
     Case("Testing callbacks with 5 uint64s", test_dispatch5<uint64_t>),
 #endif
 #elif DO_SMALL_TEST